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RE: Requesting 8-bit grayscale from the converter

I was basing my implicit assumption (that it didn't use to work) on the
attached e-mail. Is this information out of date?

Thanks,
Aaron

--------------------------------------------------
Aaron Sher
Principal Software Engineer
Vanteon Corporation
(585) 248-0510 x250

> -----Original Message-----
> From: email@hidden
> [mailto:email@hidden]On Behalf Of Paul Danbold
> Sent: Tuesday, February 18, 2003 5:24 PM
> To: email@hidden
> Subject: Re: Requesting 8-bit grayscale from the converter
>
>
> Aaron,
>
> 8-bit grayscale (kPMGray_8) is supported on both 10.1.x and 10.2.x.
> But the sample code does not do a good job of showing how a PM can
> specify and process grayscale output. If your driver is based on the
> SamplePM you will need to make the following changes:
>
> 1. Specify a grayscale profile in your PrinterInfo ticket. So, for
> example, in PMColorDeviceProfiles.xml ...
>
> <dict>
> <key>PMColorDeviceProfileID</key>
> <integer>1</integer>
> <key>PMColorDeviceProfileName</key>
> <string>Grayscale</string>
> <key>PMColorDeviceProfileURL</key>
>
> <string>file://localhost//System/Library/ColorSync/Profiles/
> Generic%20Gray%20Profile.icc</string>
> </dict>
>
> 2. Tell the converter that you want to use this profile. In the sample
> code, the hpVerifyColorSyncProfileID function should, but does not,
> return a valid profile id to put into the converter setup ticket. If
> the profile id for the grayscale profile is "1", then
> hpVerifyColorSyncProfileID() should return "1".
>
> 3. The sample code shows how to process color output (kPMXRGB_32) from
> the converter. In hpCreateConverterSetup() that means setting
> kPMRequestedPixelFormatKey to kPMGray_8, instead of kPMXRGB_32, in the
> converter setup ticket. And methods in EnginePCL.cp (e.g. PrintBand)
> need to be modified to handle grayscale data.
>
> I hope this helps.
>
> -Paul
>
>
>
> On Tuesday, February 18, 2003, at 09:57 AM, Aaron Sher wrote:
>
> > I heard a rumor that the converter can now support 8-bit grayscale. Is
> > this
> > true? If so, what version was it introduced in?
> >
> > Thanks,
> > Aaron
> >
> > --------------------------------------------------
> > Aaron Sher
> > Principal Software Engineer
> > Vanteon Corporation
> > (585) 248-0510 x250
> > _______________________________________________
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From: "Sher, Aaron" <email@hidden>
To: "Shadunsky, Alla" <email@hidden>, "McGillivray, Dan"
<email@hidden>
Cc: "Guy Wong" <email@hidden>, "Lafford, Ann" <email@hidden>
Subject: FW: TIOGADEV> Greyscale output from PMRasterBand
Date: Tue, 18 Jun 2002 07:48:21 -0500
Message-ID: <email@hidden>
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0)
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I guess this answers the question of whether or not we can get better
performance by having the OS do the color-to-grayscale conversion.

Aaron

> -----Original Message-----
> From: email@hidden
> [mailto:email@hidden]On Behalf Of Paul Danbold
> Sent: Monday, June 17, 2002 6:23 PM
> To: email@hidden
> Subject: Re: TIOGADEV> Greyscale output from PMRasterBand
>
>
> Graham,
>
> This is our bug to fix. It's been the topic of several TiogaDev
> emails. It
> looks like our code is converting a grayscale profile into a 3
component
> colorspace, subsequently setting up an invalid CG context, hence the
error
> message you're seeing. For now the recommended workaround is to
> request RGB
> and do the color->gray conversion in your PM.
>
> -Paul
>
>
> On 6/17/02 8:21 AM, "Graham Miln" <email@hidden> wrote:
>
> > Dear Paul and the Tioga group,
> >
> > Sorry for not getting back to you about our conversations at the
WWDC.
> > Things have been nice and busy here. Lots of new printers (and
numerous
> > older models) to get up and running. I will try and get around to
filing
> > some bug reports shortly :-)
> >
> > I am currently trying to get pure greyscale raster data from the Mac
OS
> > X pre-Jaguar PMRasterBand structure.
> >
> > Within the BeginJob routine we are passing back the following values
to
> > the converter via the kPMConverterSetupTicket:
> >
> > kPMRequestedPixelFormatKey = kPMGray_8
> > kPMRequestedPixelLayoutKey = kPMDataPlanar
> >
> > This results in a 1003 printing error being returned via the Print
> > Center user interface. The console logs the following message from
Core
> > Graphics:
> >
> >
>
/System/Library/Printers/Libraries/PrintJobMgr/Contents/MacOS/PrintJobMg
r:
> > kCGErrorFailure : CGBitmapContextCreate: unsupported parameter
> > combination: 8 bits/component; 8 bits/pixel; 3-component colorspace;
> > kCGImageAlphaNone.
> >
> > I have tried a few combinations but each time the above error and
> > message is returned.
> >
> > Which combination of format and layout should I be using the get 8
bit
> > greyscale data out of the bands?
> >
> > Thanks in advance!
> >
> > Graham
> > --
> > Graham Miln, Software Engineer
> > mailto:email@hidden
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 >Re: Requesting 8-bit grayscale from the converter (From: Paul Danbold <email@hidden>)



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